OBD-II code · Network
U0240 Lost Communication With Entrapment Control Module B
ECU lost communication with entrapment control module B (anti-pinch protection on windows/sunroof/doors).
Is it safe to drive with U0240?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule unpowered
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Entrapment Module B, Can Bus
Related codes
- U0239Lost Communication With Entrapment Control Module A
- U023CLost Communication With Image Processing Module C
- U023DLost Communication With Front Distance Range Sensor - Left
- U023ELost Communication With Front Distance Range Sensor - Right
- U0241Lost Communication With Headlamp Control Module A
- U0242Lost Communication With Headlamp Control Module B
- U0243Lost Communication With Parking Assist Control Module B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.